If xy2= 12 and xy = 4, then x =

admin2017-10-16  3

问题 If xy2= 12 and xy = 4, then x =

选项 A、1
B、2
C、
D、2/3
E、4/3

答案E

解析 From the given equations xy2= 12 and xy = 4, it follows that 12 = xy4 =(xy)y = 4y, and so y = 3. Substituting y= 3 in the equation xy = 4 gives 3x = 4, or x = 4/3. Thus the correct answer is Choice E.
This explanation uses the following strategy.
Strategy 8: Search for a Mathematical Relationship
转载请注明原文地址:https://kaotiyun.com/show/MrkO777K
本试题收录于: GRE QUANTITATIVE题库GRE分类
0

最新回复(0)